Roll Skia from a195d101f96c to 9791e50e3da4 (5 revisions)

https://skia.googlesource.com/skia.git/+log/a195d101f96c..9791e50e3da4

2020-09-15 mtklein@google.com impl q14x2 ops in interpreter
2020-09-15 mtklein@google.com make skvx::if_then_else work at byte granularity
2020-09-15 michaelludwig@google.com Fully disable CCPR for unit test
2020-09-15 bsalomon@google.com SkYUVAPixmaps::toLegacy() init unused mapping for missing alpha channel
2020-09-15 csmartdalton@google.com Relax SkStrokeRec::hasEqualEffect

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-autoroll
Please CC scroggo@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+doc/master/autoroll/README.md

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Cq-Do-Not-Cancel-Tryjobs: true
Bug: None
Tbr: scroggo@google.com
Change-Id: Ia6e3e9a223dde22c9fcef7c5a00149e8336e24db
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2412957Reviewed-by: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Commit-Queue: chromium-autoroll <chromium-autoroll@skia-public.iam.gserviceaccount.com>
Cr-Commit-Position: refs/heads/master@{#807261}

DEPS

@@ -195,7 +195,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling Skia
   # and whatever else without interference from each other.
-  'skia_revision': 'a195d101f96c3d0d2c3d67b1a84d1286dce52719',
+  'skia_revision': '9791e50e3da45b730d81fda69bf6d091f12177ab',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling V8
   # and whatever else without interference from each other.